Voltage generating circuit in semiconductor integrated circuit
AssigneesHitachi, Ltd., Texas Instruments Incorporated
InventorsToshiyuki Sakuta, Tomohiro Suzuki, Yuriko Iizuka
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Abstract
A voltage generating circuit in a semiconductor integrated circuit driven by two sorts of power supply voltages, includes a unit for generating plural sorts of signals; a unit for selecting one of the plural sorts of signals in response to an operation mode of the semiconductor integrated circuit; and a pumping unit for producing either a first predetermined voltage higher than the high power supply voltage among the two sorts of power supply voltages, or a second predetermined voltage lower than the low power supply voltage by a pumping operation based upon the signal selected by the selecting unit.
Claims34
A semiconductor integrated circuit comprising:
- a first oscillating circuit outputting a first pulse signal having a first frequency;
- a second oscillating circuit outputting a second pulse signal having a second frequency;
- a third oscillating circuit outputting a third pulse signal having a third frequency which is lower than said first frequency and is lower than said second frequency;
- a first selector having a first input terminal coupled to said first oscillating circuit for receiving said first pulse signal, a second input terminal coupled to said third oscillating circuit for receiving said third pulse signal and an output terminal;
- a second selector having a first input terminal coupled to said second oscillating circuit for receiving said second pulse signal, a second input terminal coupled to said third oscillating circuit for receiving said third pulse signal and an output terminal;
- a first pumping circuit having an input terminal coupled to said output terminal of said first selector and an output terminal for outputting a first voltage;
- and
- a second pumping circuit having an input terminal coupled to said output terminal of said second selector and an output terminal for outputting a second voltage.
A semiconductor integrated circuit comprising:
- a first oscillating circuit outputting a first signal having a first frequency;
- a second oscillating circuit outputting a second signal having a second frequency;
- a third oscillating circuit outputting a third signal having a third frequency which is lower than said first frequency and is lower than said second frequency;
- a first pumping circuit coupled to an output of said first oscillating circuit and an output of said third oscillating circuit and generating a first voltage;
- and
- a second pumping circuit coupled to an output of said second oscillating circuit and an output of said third oscillating circuit and generating a second voltage.
Dependencies are inferred from the claim text.